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In this paper,we propose a two-grid algorithm for solving the stream function formulation of the stationary Navier-Stokes equations.The algorithm is constructed by reducing the original system to one small,nonlinear system on the coarse mesh space and two similar linear systems (with same stiffness matrix but different right-hand side) on the fine mesh space.The convergence analysis and error estimation of the algorithm are given for the case of conforming elements.Furthermore,the algorithm produces a numerical solution with the optimal asymptotic H2-error.Finally,we give a numerical illustration to demonstrate the effectiveness of the two-grid algorithm for solving the Navier-Stokes equations.